Spring bed bottom



Oct 19,1931 n R. w. MARQUARDT 12,096,435

SPRING BED BOTTOM Filed NOV. 18, 1935 ATTORNEY 5 Patented Oct. 19, 1937FATE SPRING BED BOTTOM Reinhold W. Marquardt, Milwaukee, Wis.Application `l\love1nber 18, 1935, Serial N0. 50,350 3 claims. t (o1.5-248) This invention relates to improvements in spring bed bottoms. Thepresent invention is a companion to application Serial Number 765,248,led December 6, 1934.

As in the above identified companion application, -it is broadly theobject of the present inv vention to minimize recoil and to increase theresilience in a spring bed bottom by the provision of a fully floatingbase upon which the coil springs are carried. The present inventionseeks to accomplish this broad result in a different and improved mannerin which side sway is inherently opposed and increased stabilityprovided by the character of the springs ywhich support the iioatingsubframe from the kmain frame.

In the drawing:

Figure l is a plan View of a bed bottom embodying the present invention,only a view of the supporting helical springs and only a portion of theconnecting structure being illustrated in full.

Figure 2 is an enlarged detail View taken in rsection transverselythrough a fragment of the main frame, subframe and top frame.

Like parts are designated by the same reference characters throughoutthe several views.

The spring bed bottom of the present invention preferably comprises fourseparate frames. There is a main frame at 3 arranged to rest upon therails of the bed. Slightly above and within this is the floatingsubframe 4 and at the top of the bed bottom in substantial registrationwith the main frame is the top marginal frame 5. Between the frames 3and 5, I may use a iioating intermediate frame 2. All of the severalframes are of generally rectangular form with rounded corners.

'Ihe strap iron supports 6 for the coil springs i are anchored to theiloating subframe 4. The coil springs 8 around the outside of the bedbottom are similar to coil springs 'l except that they are slightlyshorter by reason of the fact that they rest directly on the o'atingsubframe 4.

The tops oi coil springs 8 are connected directly with the top marginalframe 5 while the tops of ycoil springs 'l and 8 are interconnected by aspecial fabric hereinafter to be described to provide support for amattress. The intermediate frame 2 serves as a terminus for connectingwires Sand le which are laced through the intermediate portions ofhelicals 'l and 8 to support such helicals against lateral collapse.This is not essential but it is preferred where the helicals have theelongated andfhighly elastic character indicated.

The means for carrying the iioating frame 4 from the main frame 3 mayconveniently cornprise brackets mounted on the respective frames andshort helical springs interposed under compression between the twobrackets. The bracket I I is an angle bracket riveted to the inside ofthe main frame 3. The bracket I2 comprises simply a small plate rivetedto the under surface of the top iiange of the subframe 4. Between thebrackets lI and i2 is seated the at ended compression spring I5 centeredon the guide disks I6 and I'I respectively, and confined against undueexpansion by means of the adjustable tension bolt I8. The bolt alsoserves as a guide tended to prevent lateral movement between thebrackets ii and I2 in the course of compression of spring l5. As clearlyindicated in Figure l, there is a series of the brackets and supportinghelical f springs along each sideof the bed bottom assembly. Thisstructure may also be duplicated at the ends, but I prefer to use at theends short tension coil springs i9 directly connecting the subframe 4with the main frame 3.

To provide a relatively closely woven mattress fabric at the top of thestructure, I prefer to use rows of flexible metal straps 20 and 2|interposed in both directions between the rows of supporting helicals.Where the straps 2i] and 2| cross, I provide disks 22 having shallowchannels to accommodate the uppermost straps 2| and u held in place byrivets 23 which pass through the disk and both straps. Short coilsprings 24 under tension connect the respective disks with the top coilsof all of the adjacent helicals. The rivets positively prevent anyvdisplacement and consequent rubbing of the straps 20 and 2l withrespect to each other, thus eliminating one source of noise.

I have found that a bed bottom embodying this invention is unusuallystable and unusually soit. Not only does the resilience of compressionsprings I5 supplement that of the coil springs 8, but the flat endedform of the compression springs I5, supplemented by the guide of boltsI8, tends to prevent and eliminate side sway. Thus the device isexceptionally resilient in a vertical direction and is very much lessyieldable laterally.

I claim:

l. A spring structure comprising the combinaposed,the horizontal iiangeof each sub-frame rail being within and only slightly above thehorizontal flange or" the main frame rails, bracket members projectinglaterally from the horizontal flange of the sub-frame rails, anglebracket members projecting inwardly from the main frame rails topositions directly beneath the bracket members first mentioned, limitingmeans connecting the respective bracket members, and. compressionsprings interposed between respective bracket members for the support ofthe sub-frame from the main frame, together with a floating top framesubstantially directly above the main frame, g

coil springs connected with the top frame and with each other tocomprise a bed bottom fabric, and means including said sub-frame for thesupport of said coil springs.

2. In a spring structure, the combination with a portable main frame, ofa oating sub-frame within and only slightly above the main frame, a bedbottom comprising supporting springs mounted on said sub-frameindependently of the main frame, bracket members spaced along oppositeside portions of the main frame and projecting inwardly therefrom,complementary bracket members spaced at like intervals along the sidesof the sub-frame and projecting oultwardly therefrom into superposedrelation to the bracket members of the main frame, limiting meansconnecting the superposed portions of the respective bracket members,and compression springs surrounding the respective limiting means andconfined between the superposed portions of the respective bracketrmembers and between the respective frames for the support of thesubframe from the main frame.

3. A spring structure comprising the combination with a main framehaving four sides and a floating subframe having corresponding sidesspaced Within the respective sides of the main frame and at almost thesame level, bracket members connected with the respective frames andprojecting laterally in opposite directions from the corresponding sidesthereof, the bracket members connected with the respective frames havingvertically spaced superposed portions, and substantially ilat endedcompression springs interposed between the said portions of therespective bracket members and laterally disposed between thecorresponding sides of the respective frames for the support of thesubframe from the main frame.

R. W. MARQUARDT.

